• Cushman: Desmids from New England 615 



65. Staurastrum eustephanum (Ehrenb.) Ralfs. 



Breadth with processes 58//; isthmus 13 fx. Occasional, St 

 Anthony. 



66. Staurastrum Arctiscon (Ehrenb.) Lund. 



Breadth with processes 100 p, without 50^; isthmus 25 fi. 

 Rare, St. Anthony. 



SPHAEROZOSMA Corda. 1835 



67. Sphaerozosma excavatum Ralfs. . 



Breadth of filament 14^,' length of cells 12/2; isthmus 6.5//. 

 Rare, St. Anthony. 



DESMIDIUM Ag. 1824 



68. Desmidium Swartzii Ag. 



Breadth of filament 34/1; length of cell 18//. Rare, St. 

 Anthony. 



69. Desmidium coarctatum Nordst. 



Maximum breadth of filament 43.5 fi, minimum 31 /i ; length 

 26 fi. Rare, St. Anthony. 



yo. Desmidium quadratum Nordst. 



Breadth of filament 2y-2g fi\ length of cell 21—23 f J - Rare, 

 St. Anthony. 



71. Desmidium Baileyi (Ralfs) DeBary. 



Breadth of filament 23-25 fi. Rare, Rose au Rue and St. 

 Anthony. 



GYMNOZYGA Ehrenb. 1840 



72. Gymnozyga moniliformis Ehrenb. 



Breadth of filament 22//; length of cell 28 fi. Occasional, 

 Bay of Islands and St. Anthony. 



Boston Society of Natural History. 



